A 64-year-old man presents to the emergency room with a history of 2 hours of substernal chest discomfort that radiates to his lower jaw and left arm. The discomfort is associated with severe diaphoresis. Physical examination demonstrates a blood pressure of 150/90 mm Hg, bibasilar rales, and an S4. Initial cardiac biomarkers are normal. However, based on the clinical presentation and the initial ECG (ECG A), the patient undergoes an urgent cardiac catheterization and an intervention is performed.
On the following day a second ECG is obtained (ECG B).
What is the diagnosis?
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